soundcontrol: add a new version that talks directly with the HSGAIN hardware register to achieve higher Headphones volume.

Signed-off-by: Francisco Franco <franciscofranco.1990@gmail.com>
sync.c: add a module_param to fsync() calls. fsync is still disabled by default but users will have the choice of having a faster build or a safer build (for data integrity). Props for simms for busting my ass off with this one :)
arch: arm: omap4: board-tuna-display.c: purple tint fix.
Fix 80-100% purple tint at low/minimum brightness.

Credits to mpokwsths.